My “best” friend is telling people about my mental health issues?

I confided in my “friend” in confidence ages ago that I suffer from anxiety, so I sometimes shut down around other people. I’ve just found out she’s blabbed to her boyfriend and our roommates about it, and made it out to be much worse than it is. She’s said she’s “worried I’m going to k1ll myself” when I’ve never said that and never would do that. Why would she do such a thing?
My “best” friend is telling people about my mental health issues?
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